/Engine/Plugins/FX/Niagara/Source/Niagara/Public/NiagaraPreviewGrid.h
[UFUNCTION](Programming/UnrealArchitecture/Reference/Functions)(BlueprintCallable, Category=Preview) void GetPreviews ( [TArray](API\Runtime\Core\Containers\TArray)< [UNiagaraComponent](API\Plugins\Niagara\UNiagaraComponent) * > & OutPreviews )